Somehow Youtube is not working in Google Chrome, does anyone have a solution for this?

Youtube is not working in Google Chrome. Whenever I go to a youtube video all I get is a black box. I have recently updated to the newest version of flash, so that shouldn't be the problem. The only thing I have changed is the google chrome version, I have updated it to the newest version as said below. I have also installed a few add-ons, but it wasn't working before that. The add-ons are:
AniWeather
Beautify Facebook
Send from Gmail (no button)
Better Gmail

Note: I have tried disabling these extensions and the problem still occurs.

One thing you could try is joining the beta group to view all videos using the new HTML 5 <video> tag. It removes flash from the equation and the in-video ads (for now at least). I'll warn you that its not for everyone and that it is very much a beta

I had been facing this problem for about a week now. Youtube was playing on all other browsers other than chrome 4.0.249.89. I had my extensions in Google Chrome on and had installed Adblock version 1.3.27. As soon as i disabled the Adblock extension the videos in youtube began playing.

I'm having the same problem, YouTube video playback has become very inconsistent for me this past couple of weeks, I get the black screen and sometimes a script-not-loading properly error, and when I close the YouTube window, I sometimes get part of the audio playing even after the window has fully closed, this is becoming really annoying...